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Yeast As a Chassis for Developing Functional Assays to Study Human P53
14:57

Yeast As a Chassis for Developing Functional Assays to Study Human P53

Published on: August 4, 2019

Potentiating the p53 network

Daniel Menendez1, Alberto Inga, Michael A Resnick

  • 1Chromosome Stability Group, National Institute of Environmental Health Sciences, NIH, Research Triangle Park, North Carolina 27709, USA. resnick@niehs.nih.gov

Discovery Medicine
|July 31, 2010
PubMed

Insights

The p53 tumor suppressor protein regulates genes by binding to DNA. This study reveals p53 also binds noncanonical sites and works with estrogen receptors, expanding its role in cancer and stress responses.

Area of Science:

  • Molecular Biology
  • Cancer Biology
  • Genetics

Background:

  • The p53 tumor suppressor is a critical regulator of cellular responses to stress, with its expression altered in most cancers.
  • p53 functions as a sequence-specific transcription factor, binding to DNA target sequences to regulate gene expression.
  • The canonical p53 DNA response element consists of two decameric half-sites separated by a variable spacer.

Purpose of the Study:

  • To investigate the functionality of canonical and noncanonical p53 response elements (REs) in supporting transactivation by wild-type and mutant p53.
  • To examine the transcriptional synergism between p53 and the estrogen receptor (ER).
  • To expand the understanding of genes and genomic regions potentially influenced by p53.

Main Methods:

  • Analysis of p53 binding and transactivation at canonical and noncanonical REs.
  • Assessment of wild-type and cancer-associated mutant p53 activity.
  • Investigation of p53 and ER synergistic transcriptional activity.

Main Results:

  • Both wild-type and mutant p53 can drive transactivation at noncanonical half-site REs, expanding the scope of p53 regulation.
  • p53-mediated transcription is significantly enhanced by estrogen receptor (ER) acting in cis at a nearby ER target sequence.
  • The functionality of both canonical and noncanonical REs in supporting p53 transactivation and ER synergism was characterized.

Conclusions:

  • p53's regulatory role extends beyond canonical DNA binding sites to include noncanonical elements.
  • The interplay between p53 and ER offers new insights into transcriptional regulation in cancer and response to cellular stress.
  • These findings have significant implications for understanding cellular and tissue responses to various stresses.

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